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Ecosystem · Question 69

AIPMT 2009MCQMedium📈 Topic in 12% papers+4−1
1

The correct sequence of plants in hydrosere is :

  1. Volvox Hydrilla Pistia Scirpus Lantana Oak
  2. Pistia Volvox Scirpus Hydrilla Oak Lantana
  3. Oak Lantana Volvox Hydrilla Pistia Scirpus
  4. Oak Lantana Scirpus Pistia Hydrilla Volvox

Answer

(1) Volvox Hydrilla Pistia Scirpus Lantana Oak

Solution

As per NCERT, in primary succession in water (hydrarch succession) the pioneers are the small phytoplankton; they are replaced with time by free-floating angiosperms, then rooted hydrophytes, sedges and grasses, and finally the trees; the climax is a forest.

Phytoplankton ( Volvox) submerged plant ( Hydrilla) floating plant ( Pistia) reed-swamp / marsh-meadow ( Scirpus) shrub ( Lantana) forest (Oak).

Answer: (1)

AIPMT 2009

Keep practising — Ecosystem

2

Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem?

  1. Phytoplankton
  2. Zooplankton
  3. Frog
  4. Fish
AIPMT 2009
3

Consider the following statements concerning food chains: (i) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation (ii) Removal of most of the carnivores resulted in an increased population of deer (iii) The length of food chains is generally limited to 3-4 trophic levels due to energy loss (iv) The length of food chains may vary from 2 to 8 trophic levels Which two of the above statements are correct?

  1. (iii), (iv)
  2. (ii), (iii)
  3. (i), (iv)
  4. (i), (ii)
AIPMT 2008
4

The slow rate of decomposition of fallen logs in nature is due to their:

  1. low moisture content
  2. poor nitrogen content
  3. anaerobic environment around them
  4. low cellulose content
AIPMT 2008
5

About 70% of total global carbon is found in:

  1. Grasslands
  2. Agroecosystems
  3. Oceans
  4. Forests
AIPMT 2008
6

Which one of the following ecosystem types has the highest annual net primary productivity ?

  1. Temperate evergreen forest
  2. Temperate deciduous forest
  3. Tropical rain forest
  4. Tropical deciduous forest
AIPMT 2007
7

Which one of the following is not used for construction of ecological pyramids ?

  1. Rate of energy flow
  2. Dry weight
  3. Fresh weight
  4. Number of individuals
AIPMT 2006
8

Which of the following is expected to have the highest value (g/m2/yr) in a grassland ecosystem ?

  1. Net production (NP)
  2. Secondary production
  3. Tertiary production
  4. Gross production (GP)
AIPMT 2004
9

Bamboo plant is growing in a far forest then what will be the trophic level of it ?

  1. Second trophic level (T2)
  2. First trophic level (T1)
  3. Fourth trophic level (T4)
  4. Third trophic level (T3)
AIPMT 2002
10

Plant decomposers are:

  1. Protista and Animalia
  2. Animalia and Monera
  3. Monera and fungi
  4. Fungi and plants
AIPMT 2001
11

Which is the reason for highest biomass in aquatic ecosystem?

  1. Benthonic and brown algae
  2. Nanoplankton, blue green algae, green algae
  3. Diatoms
  4. Sea grass and slime moulds
AIPMT 2000

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